Re: R9 Overdrive

Posted by HH56 On 2012/7/27 16:21:14

4 is the pull in coil and 1.2 ohms sounds OK. Mine measure about 1.5 so is within the range of meter differences. 3 is the hold in coil & is of thinner wire so 4 sounds OK also. Mine measures 5.1.

The voltages sound OK. 4 is directly off the battery so 5.5-6 is maybe a tad low for a 6.3 battery but again within measurement error. 3 is fed thru the second relay coil to the hold in coil. Essentially you are measuring it at a point somewhere in a series string so voltage will be a bit lower. Removing the wire and getting a higher voltage would be correct since with the pull in coil disconnected, there is nothing loading it down.

One thing I would do next is to disconnect 4 (only) at the solenoid. Then with all the switches closed and ready for OD, use a jumper (or separate the wire from the governor pigtail) so you can ground the relay and have control from under the car. Ground that jumper to bring in the relay. You should hear it and have the 5.5-6v unloaded on the wire.

When you touch wire against the terminal, there should be a fairly decent spark and solenoid should try to come in. If it does and stays in when you move the wire off terminal, hold in coil is also OK so all is good with solenoid. If it tries to machine gun, hold in coil has a problem. If it sparks but no solenoid, then there is some kind of mechanical problem. If no spark, then need to investigate why not.

I don't remember the orientation but you can verify the wires match properly from the terminals on relay to corresponding ones on solenoid. One other thing others have run into recently with varying symptoms is the solenoid spacer installed incorrectly. That might be something to rule out if you haven't already.

EDIT: Did you do a continuity check on each wire from the relay to the solenoid. Some (not all) of the cars have a two part harness. About 3 ft from the OD, there were some black plastic connectors joining the two sections. If yours had or still have them, those connectors were problematic even when new. There is also the possibility wires were disconnected and then incorrectly rejoined out of order.